Onan 5.5 HGJAB Wiring Question - Dutchmen Owners

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Old 08-01-2019, 05:46 PM   #1
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Onan 5.5 HGJAB Wiring Question

I have a on-board Onan 5.5HGJAB - 6755k Gen. I need to know if this can be wired to push out a true 240v. Right now if I use a multimeter L1 to N=120v and L2 to N = 120v but L1 to L2 =0. From looking at the wiring diagrams the black wire is split off to go to L1 and L2 on the transfer switch. I know that true 120v/240v split phase I should get 240v when testing between L1 and L2 just like when connected to shore power. Why do I need this, well we have an inverter/charger that outputs 240v. When shore power is connected it runs through the inverter (transfer switch) to power to RV and charge the batteries. When we start the Gen the inverter does not recognize the gen power and does not switch to charging mode because of the L1 and L2 reading 0. Thanks.
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Old 08-01-2019, 06:29 PM   #2
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The power in your RV is composed of two single phase 120 volt legs not 240 v. the transfer switch makes the neutral come to the generator because there is no neutral tie in because the trailer park's power supplies that.

further explanation will be along shortly.
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Old 08-01-2019, 09:50 PM   #3
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Originally Posted by franktafl View Post
further explanation will be along shortly.
Cue a 4 paragraph dissertation in 3-2-1
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Old 08-01-2019, 11:41 PM   #4
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Cue a 4 paragraph dissertation in 3-2-1
Waiting, waiting, waiting...................
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Old 08-03-2019, 09:58 PM   #5
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Look at a previous post by me that answers this specific question.
Dutchmen News / "Change ONAN Voltage", it was a moment ago still top post in that category. Sorry I don't know how to link it directly. The short answer is no easy way to do this.
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Old 08-03-2019, 10:03 PM   #6
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Hi. I see several different questions asked and some partial answers.

To the OP: Dutchmen wired this way due to industry standards. ONAN is the gen manufacturer, they wired the internal windings to produce 2 separate 120v phases 120 degrees apart from each other. Much like a 3 phase motor produces 3 separate phases each 120 degrees apart.

There basically ends up being dead / hidden phase. More common in the EU as it relates to getting a motor to rotate the proper direction. It is done for emergencies on HV transmission and distribution lines in an open delta config here in the US. Usually 1/3 transformers down, no replacement.

The RV distribution side is really 2 independent 120v services to load balance. There is no "240v" (line to line) equipment installed. A typical home is 2 separate 120v service with ability to wire line to line for 240v equipment.

An RV transfer switch does not connect L1/L2 internally to genset. It switches both like a motor across the line starter.

While you can have ONAN re-configure the windings the downside is you will lose around 15% (maybe more) of your capacity. Basically derating your genset drastically.

My personal solution is : house power out, I fire RV UP and wait.
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Old 08-04-2019, 03:54 AM   #7
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I re-read your original post. The inverter/charger should be outputting 12vdc. Why are you saying its outputting 240vac? I have personally worked on large switchgear equipment that had inverters to produce 240 vac (EU style voltage). This was an aircraft hanger. This was very specialized (expensive) equipment. It may not be working the way you think it should, the first place I would look is at transfer switch control circuit side. That charger might be getting "cut-out" of circuit when on gen set. Will need more information to help troubleshoot.
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Old 08-04-2019, 01:54 PM   #8
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Yes, what they said...
Your shore power and generator power are configure the same as most other RV's. Your transfer switch or inverter/charger may not be.

Bottom line: TT's and RV's are usually wired for two separate 115 volt legs, but are rigged to accept two out of phase 115 volt legs (230 volts with a neutral wire) or one 30 amp or more leg.
The better systems have a transfer switch that manages the source power to keep the two legs separate, but still power all 115 volt appliances.

A high end inverter charger is usually rigged to work under all these conditions. The Onan can be wired either way but are usually supplied for RV use as one leg with high amps because it provides more usable power. If it were wired for 230 volts, you could have one leg using no power and the other leg over loaded. This would be effectively half the rated output of the generator.

Transfer switch, inverter, and charger may be all in one box or in separate boxes. But, something is connected or configured wrong. You may be able to fix it by configuring the unit or changing the wire connections or jumper wires. Look for installation or operators manuals to explain your unit or units.
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Old 08-08-2019, 01:04 AM   #9
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I called Onan and you can do it.
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Old 08-08-2019, 02:27 AM   #10
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I don’t understand why one leg should carry more than the other. If the loads are balanced ? I have two A/C’s I can put one one each leg and that should balance the lead if the draw is the same for each,.
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